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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2078a37a7d9c38864bfd3c06eb943c1701afbdbe50dc86a272e360adcc80a0a2' 
  AND token = 'GkxhFztlTzXaRWnmd6MdajXoF8Pn0kZSSOgUJm2O5KM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}